<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button id="ldh">刘德华</button>
    <button id="zxy">张学友</button>
    <img src="../../code/图片/侧脸4.jpg" title="刘德华" >
    <script>
        //修改元素的属性 src
        //1.获取元素
        var ldh=document.getElementById('ldh');
        var zxy=document.getElementById('zxy');
        var img=document.querySelector('img');
        //注册事件 处理程序
       zxy.onclick=function(){
           img.src="../../code/图片/5.jpg";
           img.title="张学友";
       }
       ldh.onclick=function(){
           img.src="../../code/图片/侧脸4.jpg";
           img.title="刘德华";
       }
    </script>
</body>
</html>